provided by British Antarctic Survey
Has around 20-40 arms. The number of arms is very variable but increases with age, more arms being added as the sunstar grows. Labidiaster radiosus is large and reaches up to around 40cm across.
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Found below 20m or so from southern South America to Sub-Antarctica and the Antarctic Peninsula.
Often seen with some of its arms raised in a feeding posture. Sunstars are primarily suspension feeders and catch food such as small crustaceans, plankton and sometimes fish from the water column, using their raised arms. Labidiaster radiosus has been considered to be the same animal as Labidiaster annulatus, consequently a lot of the literature for L. annulatus may actually apply to L. radiosus, however they are in fact two distinct species (they can be distinguished by close examination of the pedicellaria in the central disc).
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